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US 2013/0231237 A1Published application
Optical glass, preform for precision press molding and optical element using the same
AssigneeAsahi Glass Company, Limited
InventorNoriyoshi KAYABA
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Abstract
The present invention relates to an optical glass containing, in terms of % by weight on the basis of oxides, B2O3: 8 to 15%, La2O3: 27 to 40%, SiO2: 1 to 10%, ZnO: 13 to 20%, WO3: 9 to 17%, Ta2O5: 7 to 15%, ZrO2: 1 to 6%, Y2O3: 2 to 8%, and Bi2O3: 0 to 5%, in which the optical glass contains substantially no Li2O and Gd2O3, and the optical glass has a refractive index nd of 1.86 to 1.90 and an Abbe number vd of 35 to 40.
Claims6
An optical glass comprising, in terms of % by weight on the basis of oxides,
- B2O3:
- 8 to 15%,
- La2O3:
- 27 to 40%,
- SiO2:
- 1 to 10%,
- ZnO:
- 13 to 20%,
- WO3:
- 9 to 17%,
- Ta2O5:
- 7 to 15%,
- ZrO2:
- 1 to 6%,
- Y2O3:
- 2 to 8%, and
- Bi2O3:
- 0 to 5%,
- wherein the optical glass comprises substantially no Li2O and Gd2O3 and
- wherein the optical glass has a refractive index nd of 1.86 to 1.90 and an Abbe number vd of 35 to 40.
17 more elements
Dependencies are inferred from the claim text.